With floured hands form dough into 2 logs, each 12" long and 2" wide on the prepared cookie sheet. Sprinkle with confectioners' sugar. Bake 35 minutes or until slightly firm to the touch. Cool on the sheet 5 minutes. Cut biscotti diagonally into 3/4" slices. Arrange cut sides down on baking sheet and bake until crisp, around 10 minutes. Cool on rack. Makes around 30.